<div class="col-sm-2">
    <div id="header1" class="panel-heading" data-toggle="collapse" data-target="#sub1">
        <a href="#" class="list-group-item active">用户管理</a>
    </div>
    <div id="sub1" class="collapse in panel-collapse">
        <a href="/admin/userlist" class="list-group-item <%= flag==1?'current':''%>">用户列表</a>
        <a href="/admin/adduser" class="list-group-item <%= flag==2||flag==3?'current':''%>">
            <%= flag==3?'修改用户':'添加用户'%>
        </a>
    </div>
</div>